linux-kernel - Re: [RFC PATCH 3/8] qaic: Create char dev

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Message-ID: <20200514141211.GA2643665@kroah.com>
Date:   Thu, 14 May 2020 16:12:11 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     arnd@...db.de, manivannan.sadhasivam@...aro.org,
        bjorn.andersson@...aro.org, wufan@...eaurora.org,
        pratanan@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/8] qaic: Create char dev

On Thu, May 14, 2020 at 08:07:41AM -0600, Jeffrey Hugo wrote:
>  /* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. */
>  
> +#include <linux/cdev.h>
> +#include <linux/idr.h>
> +#include <linux/list.h>
> +#include <linux/kref.h>
> +#include <linux/mhi.h>
>  #include <linux/module.h>
>  #include <linux/msi.h>
> +#include <linux/mutex.h>
>  #include <linux/pci.h>
>  #include <linux/pci_ids.h>
>  
> @@ -13,9 +19,242 @@
>  #define PCI_DEV_AIC100			0xa100
>  
>  #define QAIC_NAME			"Qualcomm Cloud AI 100"
> +#define QAIC_MAX_MINORS			256

Why have a max?

Why not just use a misc device so you make the logic a lot simple, no
class or chardev logic to mess with at all.

thanks,

greg k-h